On 2/27/13 10:54 AM, jesmin jahan wrote:
Many thanks to you Justin for your help.

Now my .mdp file looks like:

constraints         =  none
integrator          =  md

pbc                 =  no
verlet-buffer-drift = -1
dt                  =  0.001
nsteps              =  0
ns_type             = simple
comm-mode           = angular
rlist               = 0
rcoulomb            = 0
rvdw                = 0
nstlist             = 0
rgbradii            = 0
nstgbradii          = 1
coulombtype         = cutoff
vdwtype             = cutoff
implicit_solvent    =  GBSA
gb_algorithm        =  HCT ;
sa_algorithm        =  None
gb_dielectric_offset    = 0.02

optimize_fft             = yes
energygrps               = protein

And when I run mdrun, it says

"OpenMP threads have been requested with cut-off scheme Group, but
these are only supported with cut-off scheme Verlet"

Now if I add

cutoff-scheme       = Verlet

It says

  With Verlet lists only full pbc or pbc=xy with walls is supported

   With Verlet lists nstlist should be larger than 0


So, what is the solution??


Use the group cutoff scheme rather than Verlet, otherwise we wind up right back where we were before.

Also,  you told me

"Note that implicit solvent calculations can be run on no more than 2
processors.  You'll get a fatal error if you try to use more."

Is there any documentation for this? Can I cite you if I want to add
this information in an article?


It's a bug, listed on Redmine somewhere. I doubt that requires any sort of citation, but if anyone asks, there are discussions in the list archive and on redmine.gromacs.org.

-Justin

--
========================================

Justin A. Lemkul, Ph.D.
Research Scientist
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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